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import unittest
import test.support
import io
import ast
import _ast
import unparse
for_else = """\
def f():
for x in range(10):
break
else:
y = 2
z = 3
"""
while_else = """\
def g():
while True:
break
else:
y = 2
z = 3
"""
relative_import = """\
from . import fred
from .. import barney
from .australia import shrimp as prawns
"""
nonlocal_ex = """\
def f():
x = 1
def g():
nonlocal x
x = 2
y = 7
def h():
nonlocal x, y
"""
# also acts as test for 'except ... as ...'
raise_from = """\
try:
1 / 0
except ZeroDivisionError as e:
raise ArithmeticError from e
"""
class_decorator = """\
@f1(arg)
@f2
class Foo: pass
"""
class UnparseTestCase(unittest.TestCase):
# Tests for specific bugs found in earlier versions of unparse
def check_roundtrip(self, code1, filename="internal"):
ast1 = compile(code1, filename, "exec", _ast.PyCF_ONLY_AST)
unparse_buffer = io.StringIO()
unparse.Unparser(ast1, unparse_buffer)
code2 = unparse_buffer.getvalue()
ast2 = compile(code2, filename, "exec", _ast.PyCF_ONLY_AST)
self.assertEqual(ast.dump(ast1), ast.dump(ast2))
def test_del_statement(self):
self.check_roundtrip("del x, y, z")
def test_shifts(self):
self.check_roundtrip("45 << 2")
self.check_roundtrip("13 >> 7")
def test_for_else(self):
self.check_roundtrip(for_else)
def test_while_else(self):
self.check_roundtrip(while_else)
def test_unary_parens(self):
self.check_roundtrip("(-1)**7")
self.check_roundtrip("not True or False")
self.check_roundtrip("True or not False")
def test_integer_parens(self):
self.check_roundtrip("3 .__abs__()")
def test_chained_comparisons(self):
self.check_roundtrip("1 < 4 <= 5")
self.check_roundtrip("a is b is c is not d")
def test_function_arguments(self):
self.check_roundtrip("def f(): pass")
self.check_roundtrip("def f(a): pass")
self.check_roundtrip("def f(b = 2): pass")
self.check_roundtrip("def f(a, b): pass")
self.check_roundtrip("def f(a, b = 2): pass")
self.check_roundtrip("def f(a = 5, b = 2): pass")
self.check_roundtrip("def f(*, a = 1, b = 2): pass")
self.check_roundtrip("def f(*, a = 1, b): pass")
self.check_roundtrip("def f(*, a, b = 2): pass")
self.check_roundtrip("def f(a, b = None, *, c, **kwds): pass")
self.check_roundtrip("def f(a=2, *args, c=5, d, **kwds): pass")
self.check_roundtrip("def f(*args, **kwargs): pass")
def test_relative_import(self):
self.check_roundtrip(relative_import)
def test_nonlocal(self):
self.check_roundtrip(nonlocal_ex)
def test_raise_from(self):
self.check_roundtrip(raise_from)
def test_bytes(self):
self.check_roundtrip("b'123'")
def test_annotations(self):
self.check_roundtrip("def f(a : int): pass")
self.check_roundtrip("def f(a: int = 5): pass")
self.check_roundtrip("def f(*args: [int]): pass")
self.check_roundtrip("def f(**kwargs: dict): pass")
self.check_roundtrip("def f() -> None: pass")
def test_set_literal(self):
self.check_roundtrip("{'a', 'b', 'c'}")
def test_set_comprehension(self):
self.check_roundtrip("{x for x in range(5)}")
def test_dict_comprehension(self):
self.check_roundtrip("{x: x*x for x in range(10)}")
def test_class_decorators(self):
self.check_roundtrip(class_decorator)
def test_main():
test.support.run_unittest(UnparseTestCase)
if __name__ == '__main__':
test_main()
|
